<?php

namespace Faker\Provider;

use Faker\Calculator\Iban;
use Faker\Calculator\Luhn;

class Payment extends Base
{
    public static $expirationDateFormat = "m/y";

    protected static $cardVendors = array(
        'Visa', 'Visa', 'Visa', 'Visa', 'Visa',
        'MasterCard', 'MasterCard', 'MasterCard', 'MasterCard', 'MasterCard',
        'American Express', 'Discover Card'
    );

    // see http://en.wikipedia.org/wiki/Bank_card_number for a reference of existing prefixes
    protected static $cardParams = array(
        'Visa' => array(
            "4539########",
            "4539###########",
            "4556########",
            "4556###########",
            "4916########",
            "4916###########",
            "4532########",
            "4532###########",
            "4929########",
            "4929###########",
            "40240071####",
            "40240071#######",
            "4485########",
            "4485###########",
            "4716########",
            "4716###########",
            "4###########",
            "4##############"
        ),
        'MasterCard' => array(
            "51#############",
            "52#############",
            "53#############",
            "54#############",
            "55#############"
        ),
        'American Express' => array(
            "34############",
            "37############"
        ),
        'Discover Card' => array(
            "6011###########"
        ),
    );

    /**
     * @var array list of IBAN formats, source: @link https://www.swift.com/standards/data-standards/iban
     */
    protected static $ibanFormats = array(
        'AD' => array(array('n', 4),    array('n', 4),  array('c', 12)),
        'AE' => array(array('n', 3),    array('n', 16)),
        'AL' => array(array('n', 8),    array('c', 16)),
        'AT' => array(array('n', 5),    array('n', 11)),
        'AZ' => array(array('a', 4),    array('c', 20)),
        'BA' => array(array('n', 3),    array('n', 3),  array('n', 8),  array('n', 2)),
        'BE' => array(array('n', 3),    array('n', 7),  array('n', 2)),
        'BG' => array(array('a', 4),    array('n', 4),  array('n', 2),  array('c', 8)),
        'BH' => array(array('a', 4),    array('c', 14)),
        'BR' => array(array('n', 8),    array('n', 5),  array('n', 10), array('a', 1),  array('c', 1)),
        'CH' => array(array('n', 5),    array('c', 12)),
        'CR' => array(array('n', 3),    array('n', 14)),
        'CY' => array(array('n', 3),    array('n', 5),  array('c', 16)),
        'CZ' => array(array('n', 4),    array('n', 6),  array('n', 10)),
        'DE' => array(array('n', 8),    array('n', 10)),
        'DK' => array(array('n', 4),    array('n', 9),  array('n', 1)),
        'DO' => array(array('c', 4),    array('n', 20)),
        'EE' => array(array('n', 2),    array('n', 2),  array('n', 11), array('n', 1)),
        'ES' => array(array('n', 4),    array('n', 4),  array('n', 1),  array('n', 1),  array('n', 10)),
        'FR' => array(array('n', 5),    array('n', 5),  array('c', 11), array('n', 2)),
        'GB' => array(array('a', 4),    array('n', 6),  array('n', 8)),
        'GE' => array(array('a', 2),    array('n', 16)),
        'GI' => array(array('a', 4),    array('c', 15)),
        'GR' => array(array('n', 3),    array('n', 4),  array('c', 16)),
        'GT' => array(array('c', 4),    array('c', 20)),
        'HR' => array(array('n', 7),    array('n', 10)),
        'HU' => array(array('n', 3),    array('n', 4),  array('n', 1),  array('n', 15), array('n', 1)),
        'IE' => array(array('a', 4),    array('n', 6),  array('n', 8)),
        'IL' => array(array('n', 3),    array('n', 3),  array('n', 13)),
        'IS' => array(array('n', 4),    array('n', 2),  array('n', 6),  array('n', 10)),
        'IT' => array(array('a', 1),    array('n', 5),  array('n', 5),  array('c', 12)),
        'KW' => array(array('a', 4),    array('n', 22)),
        'KZ' => array(array('n', 3),    array('c', 13)),
        'LB' => array(array('n', 4),    array('c', 20)),
        'LI' => array(array('n', 5),    array('c', 12)),
        'LT' => array(array('n', 5),    array('n', 11)),
        'LU' => array(array('n', 3),    array('c', 13)),
        'LV' => array(array('a', 4),    array('c', 13)),
        'MC' => array(array('n', 5),    array('n', 5),  array('c', 11), array('n', 2)),
        'MD' => array(array('c', 2),    array('c', 18)),
        'ME' => array(array('n', 3),    array('n', 13), array('n', 2)),
        'MK' => array(array('n', 3),    array('c', 10), array('n', 2)),
        'MR' => array(array('n', 5),    array('n', 5),  array('n', 11), array('n', 2)),
        'MT' => array(array('a', 4),    array('n', 5),  array('c', 18)),
        'MU' => array(array('a', 4),    array('n', 2),  array('n', 2),  array('n', 12), array('n', 3),  array('a', 3)),
        'NL' => array(array('a', 4),    array('n', 10)),
        'NO' => array(array('n', 4),    array('n', 6),  array('n', 1)),
        'PK' => array(array('a', 4),    array('c', 16)),
        'PL' => array(array('n', 8),    array('n', 16)),
        'PS' => array(array('a', 4),    array('c', 21)),
        'PT' => array(array('n', 4),    array('n', 4),  array('n', 11), array('n', 2)),
        'RO' => array(array('a', 4),    array('c', 16)),
        'RS' => array(array('n', 3),    array('n', 13), array('n', 2)),
        'SA' => array(array('n', 2),    array('c', 18)),
        'SE' => array(array('n', 3),    array('n', 16), array('n', 1)),
        'SI' => array(array('n', 5),    array('n', 8),  array('n', 2)),
        'SK' => array(array('n', 4),    array('n', 6),  array('n', 10)),
        'SM' => array(array('a', 1),    array('n', 5),  array('n', 5),  array('c', 12)),
        'TN' => array(array('n', 2),    array('n', 3),  array('n', 13), array('n', 2)),
        'TR' => array(array('n', 5),    array('n', 1),  array('c', 16)),
        'VG' => array(array('a', 4),    array('n', 16)),
    );

    /**
     * @return string Returns a credit card vendor name
     *
     * @example 'MasterCard'
     */
    public static function creditCardType()
    {
        return static::randomElement(static::$cardVendors);
    }

    /**
     * Returns the String of a credit card number.
     *
     * @param string  $type      Supporting any of 'Visa', 'MasterCard', 'American Express', and 'Discover'
     * @param boolean $formatted Set to true if the output string should contain one separator every 4 digits
     * @param string  $separator Separator string for formatting card number. Defaults to dash (-).
     * @return string
     *
     * @example '4485480221084675'
     */
    public static function creditCardNumber($type = null, $formatted = false, $separator = '-')
    {
        if (is_null($type)) {
            $type = static::creditCardType();
        }
        $mask = static::randomElement(static::$cardParams[$type]);

        $number = static::numerify($mask);
        $number .= Luhn::computeCheckDigit($number);

        if ($formatted) {
            $p1 = substr($number, 0, 4);
            $p2 = substr($number, 4, 4);
            $p3 = substr($number, 8, 4);
            $p4 = substr($number, 12);
            $number = $p1 . $separator . $p2 . $separator . $p3 . $separator . $p4;
        }

        return $number;
    }

    /**
     * @param boolean $valid True (by default) to get a valid expiration date, false to get a maybe valid date
     * @return \DateTime
     * @example 04/13
     */
    public function creditCardExpirationDate($valid = true)
    {
        if ($valid) {
            return $this->generator->dateTimeBetween('now', '36 months');
        }

        return $this->generator->dateTimeBetween('-36 months', '36 months');
    }

    /**
     * @param boolean $valid                True (by default) to get a valid expiration date, false to get a maybe valid date
     * @param string  $expirationDateFormat
     * @return string
     * @example '04/13'
     */
    public function creditCardExpirationDateString($valid = true, $expirationDateFormat = null)
    {
        return $this->creditCardExpirationDate($valid)->format(is_null($expirationDateFormat) ? static::$expirationDateFormat : $expirationDateFormat);
    }

    /**
     * @param  boolean $valid True (by default) to get a valid expiration date, false to get a maybe valid date
     * @return array
     */
    public function creditCardDetails($valid = true)
    {
        $type = static::creditCardType();

        return array(
            'type'   => $type,
            'number' => static::creditCardNumber($type),
            'name'   => $this->generator->name(),
            'expirationDate' => $this->creditCardExpirationDateString($valid)
        );
    }

    /**
     * International Bank Account Number (IBAN)
     *
     * @link http://en.wikipedia.org/wiki/International_Bank_Account_Number
     * @param  string  $countryCode ISO 3166-1 alpha-2 country code
     * @param  string  $prefix      for generating bank account number of a specific bank
     * @param  integer $length      total length without country code and 2 check digits
     * @return string
     */
    public static function iban($countryCode, $prefix = '', $length = null)
    {
        $countryCode = is_null($countryCode) ? self::randomKey(self::$ibanFormats) : strtoupper($countryCode);

        $format = !isset(static::$ibanFormats[$countryCode]) ? null : static::$ibanFormats[$countryCode];
        if ($length === null) {
            if ($format === null) {
                $length = 24;
            } else {
                $length = 0;
                foreach ($format as $part) {
                    list($class, $groupCount) = $part;
                    $length += $groupCount;
                }
            }
        }
        if ($format === null) {
            $format = array(array('n', $length));
        }

        $expandedFormat = '';
        foreach ($format as $item) {
            list($class, $length) = $item;
            $expandedFormat .=  str_repeat($class, $length);
        }

        $result = $prefix;
        $expandedFormat = substr($expandedFormat, strlen($result));
        foreach (str_split($expandedFormat) as $class) {
            switch ($class) {
                default:
                case 'c':
                    $result .= mt_rand(0, 100) <= 50 ? static::randomDigit() : strtoupper(static::randomLetter());
                    break;
                case 'a':
                    $result .= strtoupper(static::randomLetter());
                    break;
                case 'n':
                    $result .= static::randomDigit();
                    break;
            }
        }

        $result = static::addBankCodeChecksum($result, $countryCode);

        $checksum = Iban::checksum($countryCode . '00' . $result);

        return $countryCode . $checksum . $result;
    }

    /**
     * Calculates a checksum for the national bank and branch code part in the IBAN.
     *
     * @param  string $iban        randomly generated $iban
     * @param  string $countryCode ISO 3166-1 alpha-2 country code
     * @return string IBAN with one character altered to a proper checksum
     */
    protected static function addBankCodeChecksum($iban, $countryCode = '')
    {
        return $iban;
    }

    /**
     * Return the String of a SWIFT/BIC number
     *
     * @example 'RZTIAT22263'
     * @link    http://en.wikipedia.org/wiki/ISO_9362
     * @return  string Swift/Bic number
     */
    public static function swiftBicNumber()
    {
        return self::regexify("^([A-Z]){4}([A-Z]){2}([0-9A-Z]){2}([0-9A-Z]{3})?$");
    }
}
